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Visual functional outcomes after bilateral implantation of a trifocal diffractive intraocular lens
Session Title: Multifocal IOL results
Session Date/Time: Sunday 06/10/2013 | 14:30-16:00
Paper Time: 15:09
Venue: Forum (Ground Floor)
First Author: : J.Marques PORTUGAL
Co Author(s): : A. Martins Rosa F. Silva B. Quendera C. Lobo J. Mira J. Murta
To assess clinical outcomes, visual function and spectacle independence after bilateral implantation of a new aspheric diffractive trifocal intraocular lens (IOL).
Ophthalmology Unit, Centro Hospitalar e Universitįrio de Coimbra (CHUC), Coimbra, Portugal.
Visual Neuroscience Laboratory, IBILI, Faculty of Medicine, Coimbra, Portugal.
Twenty eyes of ten patients with bilateral implantation of Finevision trifocal IOLs were evaluated one month postoperatively. All eyes had a one-week time frame between surgeries. Monocular and binocular, uncorrected and corrected visual acuities (distance, near and intermediate) were measured. Contrast sensitivity was evaluated with a computerized psychophysical software Metrovision that tests different spatial frequencies (0.6 - 1.1 - 2.2 - 3.4 - 7.1 14.2 cpd) under static (0 Hz) and dynamic (10 Hz) conditions, both in photopic (80-90 cd/m²) and mesopic (0.08 cd/m²) settings. The same software was used for pupillometry (100cd/m²; 10cd/m² and 1cd/m²) and glare (5cd/m² and 1cd/m²) evaluation. We tested motion discrimination and achromatic contrast discrimination using two innovative 2AFC (two-alternative forced choice) psychophysical tests that required comparison and discrimination of visual features between two separated moving dots. Defocus curves were calculated over a range of +4.00 and -4.00D. A validated questionnaire to evaluate overall satisfaction was included.
Distance uncorrected visual acuity (VA) was 0.0 ± 0.10 logMAR and distance corrected VA was 0.0 ± 0.05 logMAR. Distance corrected near VA was 0.17 ± 0.05 logMAR and distance corrected intermediate VA was 0.0 ± 0.05 logMAR.
Patients could read 28.88 ± 22.49 % and 79.45 ± 11.23 % of optotypes under a glare source of 1cd/m² and 5cd/m², respectively.
Mean photopic contrast sensitivity for high spatial frequencies (7.1 and 14.2 cpd) was 15.42 ± 3.70 dB and 12.83 ± 5.04 dB, under static and dynamic conditions, respectively. Static and dynamic mean mesopic contrast sensitivity for high spatial frequencies (7.1 and 14.2 cpd) was 10.00 ± 1.25 dB and 2.00 ± 0.40 dB, respectively.
The mean results over the horizontal meridian (0ŗ) for motion discrimination and achromatic contrast discrimination tests were: 1.08 ± 1.37 deg/s and 2.12 ± 0.97 cd/m², respectively.
Defocus curve testing showed an extended range of clear vision.
The FineVision trifocal IOL provided a satisfactory full range of vision and quality of vision parameters. The use of quantitative computerized psychophysical approaches in which testing steps can be calibrated and dynamically changed in a random manner are less prone to artifacts than classical methods and allow an objective evaluation of new IOL designs.